Limited gacha seal exchange tickets are used to exchange for 10 limited gacha seals.
How to obtain
In the gacha seal exchange, you can choose to convert 10 of your limited gacha seals into a limited gacha seal exchange ticket. This can only be done 10 times per banner, meaning a total of 100 seals can be converted.
How to use
When sparking, you are given the option to use your exchange tickets to count towards your gacha seal count. Only a total of 10 exchange tickets may be used per spark, effectively reducing the minimum number of seals required for the spark from 300 to 200.